<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>背景按钮练习</title>
	<style>
		a:link{/*未点击*/
			display:block;
			width:128px;
			height:128px;
			background-image:url("./img/b13.png");

		}
		a:hover{
			background-image:url("./img/b12.png");
		}
		a:active{/*点击后*/
			background-image:url("./img/b8.png");
		}
	</style>
</head>
<body>
	<a href="javascript:;"></a>

</body>
</html>